Influences of cold deformation and annealing on the microstructures and mechanical properties of in-situ carbon nanosheet/copper composites
FAN Leilei1, LIU Ying1,2, YAO Yupeng1, TU Ruibo1, WU Yanxia1, WANG Jian1, JING Lin2, ZHANG Caili3
1. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, China; 3. Analytical Test Center, Taiyuan University of Technology, Taiyuan 030023, China
Abstract：The microstructure regulation of the copper matrix constitutes an effective way to overcome the inverse relationship between the strength and plasticity of carbon nanosheet/Cu composites. In this paper, the composites were in-situ synthesized by powder metallurgy technology and subjected to cold-rolling deformation and annealing treatment. The influences of cold-rolling deformation and annealing temperature on the microstructures and mechanical properties of the in-situ synthesized carbon nanosheet/Cu composites and the corresponding mechanism were investigated. The results show that during the rolling process, the grain size of Cu matrix is gradually reduced with the increase of cold-rolling amount, forming a {110}〈113〉 texture, as well as the density of dislocations increase greatly. With the effects of grain refinement, deformation texture and dislocation strengthening, the strength of the carbon nanosheet/Cu composites is significantly enhanced, especially, the composite with the deformation amount of 40% exhibits the most obvious enhancement, the yield strength and tensile strength reaches 332 MPa and 375 MPa, respectively, which are enhanced by 73.8% and 22.1% in comparison with the undeformed composites, however, due to the formation of deformation texture, the plasticity decreases, and the elongation is only maintained at 6.7%. After annealing, there is a slight reduction in the strength of the cold deformed carbon nanosheet/Cu composites but the plasticity restores because of the dislocation recovery or recrystallization of the copper matrix and the more uniform grain orientation. The composite annealed at 200 ℃ exhibits the best matching of strength and plasticity, and the best mechanical properties with the yield strength, tensile strength, and elongation of 284 MPa, 373 MPa, and 10.6%, respectively, the tensile strength is increased by 21.5% compared with the initial state, and its elongation is decreased by only 2.1%.
樊磊磊, 刘颖, 要宇鹏, 涂瑞博, 吴艳霞, 王剑, 敬霖, 张彩丽. 冷变形与退火对原位碳纳米片/铜复合材料组织和力学性能的影响[J]. 粉末冶金材料科学与工程, 2025, 30(1): 22-34.
FAN Leilei, LIU Ying, YAO Yupeng, TU Ruibo, WU Yanxia, WANG Jian, JING Lin, ZHANG Caili. Influences of cold deformation and annealing on the microstructures and mechanical properties of in-situ carbon nanosheet/copper composites. Materials Science and Engineering of Powder Metallurgy, 2025, 30(1): 22-34.
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2025, Vol. 30 
